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• HMS Oxley became the first Royal Navy submarine to be lost in the war when she was either torpedoed or rammed in error off the Norwegian coast by another Royal Navy submarine. Only two of the fifty-three crew survived. ww2dbase [AC]

• Canada declared war on Germany. ww2dbase [TH]

• HMS Eagle arrived at Colombo, Ceylon. ww2dbase [Eagle | Colombo | CPC]

• Soviet ambassador to Poland Nikolai Szaranow was recalled from Warsaw. ww2dbase [Warsaw | TH]
• SS-Brigadeführer Wilhelm Fritz von Roettig became the first German general to die in World War II when he was killed in Action at Opoczno, Poland at about 1415 hours. ww2dbase [Wilhelm von Roettig | Opoczno | AC]
• German troops made a breakthrough near Kutno and Sandomierz in Poland. ww2dbase [Invasion of Poland | TH]

• The Battle of the Atlantic officially began. On the very same day, the British Admiralty began organizing a convoy system. ww2dbase [Start of the Battle of the Atlantic | TH, CPC]

10 Sep 1939 Interactive Map